Battery Controller Steady State Detection for Energy Management
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Solution Overview
Problem
Existing battery management systems for electric vehicles lack accurate methods to determine the steady state of batteries, leading to inefficient energy management and reduced battery lifespan due to voltage deviations and instability during charging and discharging.
Innovation Solution
A battery managing apparatus that includes a battery controller and a time controller to determine when the battery enters a steady state based on charge and discharge currents, allowing for optimized control, balancing, and health monitoring by waking up the system during this state to measure voltages, internal resistance, and perform balancing operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the battery management system continuously monitors battery state, then measurement precision and reliability are improved, but energy consumption increases and productivity decreases
Solution Approach 1:
The patent implements periodic monitoring by having the battery management system wake up at predetermined intervals to perform measurements and assessments. The controller transitions between sleep mode and active monitoring mode, conducting battery state evaluations at regular intervals rather than continuously. This periodic operation maintains measurement precision while significantly reducing energy consumption during idle periods.
Solution Approach 2:
The system performs preliminary assessments by detecting steady state conditions before conducting full battery measurements. The controller monitors for steady state indicators (such as voltage stabilization) and only performs comprehensive measurements when these conditions are met, preparing the system in advance to optimize the timing of energy-intensive operations.
2Reliability
If the battery management system performs continuous balancing operations, then battery reliability and homogeneity are improved, but energy loss increases and manufacturing precision requirements worsen
Solution Approach 1:
The balancing operation is executed periodically rather than continuously. The controller activates the balancing circuit at predetermined intervals to equalize cell voltages, maintaining battery reliability while minimizing energy loss. This periodic approach allows the system to achieve sufficient homogeneity without the continuous energy expenditure of constant balancing.
Solution Approach 2:
The system performs preliminary voltage measurements and assessments before initiating balancing operations. By detecting steady state conditions and evaluating voltage deviations in advance, the controller determines when balancing is actually needed, performing the energy-intensive equalization operation only when necessary to maintain reliability.
3Speed
If the battery controller remains constantly active, then response speed and productivity are improved, but energy consumption increases and device complexity worsens
Solution Approach 1:
The battery controller operates in periodic cycles, alternating between sleep mode and active monitoring mode. During active periods, the controller responds to battery events and performs measurements with full responsiveness. During sleep periods, energy consumption is minimized while the controller can still be awakened by significant events, maintaining adequate response speed without continuous operation.
Solution Approach 2:
The system uses the battery's own operational characteristics (such as voltage changes and steady state transitions) to trigger controller activation. The battery essentially services the controller by providing the conditions that determine when monitoring should occur, eliminating the need for external continuous power management while maintaining appropriate response timing.
4Productivity
If voltage measurements are taken during charging/discharging, then productivity is improved, but measurement precision deteriorates due to transient effects
Solution Approach 1:
The system performs preliminary detection of steady state conditions by monitoring voltage stabilization and current patterns before conducting formal measurements. This preliminary assessment allows the system to determine the optimal timing for accurate measurements, ensuring that voltage readings are taken when transient effects have subsided and the battery is in a stable state.
Solution Approach 2:
The controller continuously monitors battery parameters and uses feedback from voltage and current measurements to determine when steady state conditions are achieved. Based on this feedback, the system dynamically adjusts the timing of formal measurements, only proceeding when the feedback indicates stable conditions, thereby ensuring measurement precision without sacrificing overall productivity.
Data Source
AI summary
A battery managing apparatus includes a battery controller configured to determine a time when a battery enters a steady state based on a charge and discharge current of the battery. The apparatus further includes a time controller configured to wake up the battery controller based on the time when the battery enters the steady state. The battery controller is configured to control the battery in response to the time controller waking up the battery controller.